Versatile reactivity of a solvent-coordinated diiron(II) compound: synthesis and dioxygen reactivity of a mixed-valent Fe(II)Fe(III) species.

A new, DMF-coordinated, preorganized diiron compound Fe2(N-Et-HPTB)(DMF)43 (1) was synthesized, avoiding the formation of Fe(N-Et-HPTB)2 (10) and Fe2(N-Et-HPTB)(μ-MeCONH)2 (11), where N-Et-HPTB is the anion of N,N,N',N'-tetrakis[2-(1-ethylbenzimidazolyl)]-2-hydroxy-1,3-diaminopropane. Compound 1 is a versatile reactant from which nine new compounds have been generated. Transformations include solvent exchange to yield Fe2(N-Et-HPTB)(MeCN)43 (2), substitution to afford Fe2(N-Et-HPTB)(μ-RCOO)2 (3, R = Ph; 4, RCOO = 4-methyl-2,6-diphenyl benzoate]), one-electron oxidation by (Cp2Fe)(BF4) to yield a Robin-Day class II mixed-valent diiron(II,III) compound, Fe2(N-Et-HPTB)(μ-PhCOO)(DMF)23 (5), two-electron oxidation with tris(4-bromophenyl)aminium hexachloroantimonate to generate Fe2(N-Et-HPTB)Cl3(DMF)2 (6), reaction with (2,2,6,6-tetramethylpiperidin-1-yl)oxyl to form Fe5(N-Et-HPTB)2(μ-OH)4(μ-O)(DMF)24 (7), and reaction with dioxygen to yield an unstable peroxo compound that decomposes at room temperature to generate Fe4(N-Et-HPTB)2(μ-O)3(H2O)2·8DMF (8) and Fe4(N-Et-HPTB)2(μ-O)42 (9). Compound 5 loses its bridging benzoate ligand upon further oxidation to form Fe2(N-Et-HPTB)(OH)2(DMF)23 (12). Reaction of the diiron(II,III) compound 5 with dioxygen was studied in detail by spectroscopic methods. All compounds (1-12) were characterized by single-crystal X-ray structure determinations. Selected compounds and reaction intermediates were further examined by a combination of elemental analysis, electronic absorption spectroscopy, Mössbauer spectroscopy, EPR spectroscopy, resonance Raman spectroscopy, and cyclic voltammetry.